I mean use PC to obtain these data, such as total playtime, average play times, related games, etc.

Is there any homebrew tool to access official server to gain such data? Or I have to open Wii, get into NINTENDO CHANNEL, and check the data one by one? Can I use a homebrew tool or any approach to gain these data all at once?

Playstats is quite cool, but it can simply display YOUR usage while NINTENDO CHANNEL has the stats of worldwide players.

For instance, if I play Super Mario Galaxy, I can easily find out what is the average time other players spent. But if I haven't played it, I could not obtain this data.
And when I want to dig some multiplayer wiiwares which are not well-known, I can only enter NINTENDO CHANNEL to read recommendation one by one. It's time-costing. If I could obtain these date and be able to sort by own filters, it'll be more convenient.